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‘Ālika Knoll (Knoll(s)) |
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110 Miles Holes (Hole) |
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18 Fathom Bank (Bank) |
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28 Fathom Bank (Bank) |
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Aafrika-Antarktika Ahelik (Ridge) |
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Abad Santos Shoal (Reef) |
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Abbeville Basin (Basin) |
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Abbeville Mound (Mound) |
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Abra Canyon (Canyon(s)) |
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Acadia Mound (Mound) |
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Acadiana Basin (Basin) |
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Acadiana Canyon (Canyon(s)) |
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Accomac Canyon (Canyon(s)) |
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Acis North Shoal (Shoal) |
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Acis Shoals (Reef) |
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Acis South Shoal (Shoal) |
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Acis South Shoals (Shoal) |
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Adak Basin (Basin) |
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Adams Bank (Bank) |
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Addai Caddo Basin (Basin) |
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Addington Patch (Reef) |
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Adélie Trough (Submarine valley(s)) |
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Adélie Valley (Submarine valley(s)) |
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Adeline Bank (Bank) |
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Adolph Knoll (Seamount(s)) |
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Adolph Seamount (Seamount(s)) |
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Adriatic Basin (Basin) |
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Adriatic Plain (Plain) |
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Adventure Trough (Trough) |
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Afa’maolek Seamount (Seamount(s)) |
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Afrikansko-Antarkticheskaya Vozvyshennost’ (Ridge) |
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Afrikansko-Antarkticheskiy Khrebet (Ridge) |
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Afungi Canyon (Canyon(s)) |
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Agadak Canyon (Canyon(s)) |
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Aganak Canyon (Canyon(s)) |
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Agard Seamount (Seamount(s)) |
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Agassiz Basin (Trough) |
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Agassiz Valleys (Submarine valley(s)) |
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Agligadak Canyon (Canyon(s)) |
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Agouti Bank (Bank) |
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Aguinaldo Bank (Historical undersea feature) |
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Aguja Canyon (Canyon(s)) |
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Aitken Reef (Reef) |
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Aja Fracture Zone (Fracture Zone) |
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Akamai Seamount (Knoll(s)) |
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Akashi Knoll (Knoll(s)) |
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Akashi Shō (Knoll(s)) |
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Akashi Shoal (Knoll(s)) |
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Akasi Reef (Knoll(s)) |
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Alabama-Coushatta Basin (Basin) |
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Alaminos Bank (Bank) |
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Alaminos Fan (Fan) |
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Alamo Mound (Mound) |
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Alarcón Seamount (Seamount(s)) |
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Albany Canyon (Canyon(s)) |
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Albany Seamount (Seamount(s)) |
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Albatross Knoll (Knoll(s)) |
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Albay (Reef) |
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Albay Shoal (Reef) |
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Albemarle Shelf Valley (Submarine valley(s)) |
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Albemarle Valley (Submarine valley(s)) |
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Alboran Abyssal Plain (Plain) |
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Alborán Plain (Plain) |
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Alborán Trough (Trough) |
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Alcalá de Chivert Canyon (Canyon(s)) |
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Alderdice Bank (Bank) |
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Aleut Dome (Knoll(s)) |
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Aleut Knoll (Knoll(s)) |
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Aleut Trough (Submarine valley(s)) |
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Aleut Valley (Submarine valley(s)) |
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Alexandra Bank (Reef) |
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Alga Bank (Bank) |
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Alice Reef (Reef) |
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Alice Spur (Spur) |
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Alicia Anne (Atoll) |
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Alicia Annie (Atoll) |
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Alicia Annie Reef (Atoll) |
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Alicia Annie Shoals (Atoll) |
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Alicia Spur (Spur) |
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Alida (Reef) |
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Alida Reef (Reef) |
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Alida Shoal (Reef) |
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Alina Tan (Reef) |
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Alisno Reef (Reef) |
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Alison Reef (Reef) |
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Alle Bank (Bank) |
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Allegheny Seamount (Seamount(s)) |
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Allison Chiao (Reef) |
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Allison Guyot (Tablemount) |
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Almirante Leite Bank (Knoll(s)) |
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Almirante Leite Knolls (Knoll(s)) |
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Alnilam Mound (Mound) |
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Alnitak Mound (Mound) |
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Alphard Banks (Bank) |
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Alsea Ridge (Ridge) |
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Altnacraig Shoal (Shoal) |
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Alvin Canyon (Canyon(s)) |
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Amanogawa Seamounts (Seamount(s)) |
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Amanohashidate Hole (Hole)  has preferred alternative Isen Hole |
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Amatignak Basin (Basin) |
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Amatignak Canyon (Canyon(s)) |
